Well, you may be right in respect of trying to resolve the conflict from the outside, it seems the only option left for the Western European nations now given that 'the horse has bolted' on them. Unless Putin decides to use WMDs or the West can't stomach the atrocities any more and they give Russia an ultimatum to withdraw their troops, the war will grind on and Ukraine's people will continue to be slaughtered. I personally couldn't stand by and let a friendly neighbour suffer at the hand of a heartless thug and bully.
War will grind on but look already how many have escaped? Look at the Ukrainian resistance with NATO help has saved countless lives. Look at the withdraw or reposition of the Russian troops now at least allowing more people to escape.
War is war and it is always ugly. The calculations are not always rewarding. Look at the results of the Vietnam war. Look at our liberation effort in Iran. We had good people who fought with us to liberate their country but we only have bodies to show for it.
Look at the atrocities in Africa to the Christian people but to move troops in would be guerilla warfare and like the middle east it will be a never ending war.
So much to factor in and even though it may make our hearts cry, as scripture says we must have many advisors before going to war. Many advisors are needed to weigh the many factors that ultimately you must also put your nation and people first.